Voters Guide to Election Equipment Our primary voting equipment is the Unisyn OpenElect Optical Scanner (OVO), which uses a marked paper ballot read by a light reader. One optical scanner is placed in every polling place. For voters with disabilites every precinct is also equipped with a Unisyn OpenElect Ballot Marking Device (OVI). The OVI device is capable of producing ballots using several different interfaces; touch screen, audio, or sip and puff.